Fantastic demo! I love the characters (totally not biased in favor of bats or anything) and the combat is a lot of fun - great take on rhythm gaming. It's a joy to look at, and I really enjoy the weird combat backgrounds. I'm super excited to see more of this game!
One minor frustration, which is very common with indie UE games, though, is that it launches Steam VR when I run the executable. For some reason, UE4 has the SteamVR plugin enabled by default - if you can disable that in your project, it'll make the lives of folks like me a little easier!